diff --git a/modules/mol/alg/pymod/lddt.py b/modules/mol/alg/pymod/lddt.py
index 4e212279f7340ea7195b2b05854ca8bab2ffb9d7..b6b11dd9d5ffbfa39cf8877920237918018a4162 100644
--- a/modules/mol/alg/pymod/lddt.py
+++ b/modules/mol/alg/pymod/lddt.py
@@ -590,7 +590,7 @@ class lDDTScorer:
                         symmetries.append(sym_indices)
 
         if no_interchain and no_intrachain:
-            raise RuntimeError("on_interchain and no_intrachain flags are "
+            raise RuntimeError("no_interchain and no_intrachain flags are "
                                "mutually exclusive")
 
         if no_interchain: